Valve steel and superalloy bars for internal combustion engines

1. Valve steel and alloy bars for internal combustion engines are key basic materials for manufacturing intake and exhaust valves of gasoline and diesel engines. Their performance directly determines the operating efficiency, reliability and service life of engines. 2. Valve steel shall possess the following core properties: (1) High-temperature strength: Maintain sufficient strength and hardness at high temperatures to resist creep and deformation. (2) Excellent corrosion and oxidation resistance: Resist chemical erosion and oxidation caused by high-temperature fuel gas. (3) Good microstructure stability: The metallographic structure will not undergo significant changes during long-term high-temperature service. (4) High toughness: Resist brittle fracture under high-frequency impact loads. (5) Good machinability: Facilitate forging, heat treatment and mechanical processing.